📄 encrypt.cpp
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// DesFunc.cpp: implementation of the DesFunc class.
//
//////////////////////////////////////////////////////////////////////
#include <stdio.h>
#include <stdlib.h>
#include <memory.h>
#include "encrypt.h"
static unsigned char C[17][28],D[17][28],K[17][48],c,ch1;
static int ip_tab[64]=
{
58,50,42,34,26,18,10,2,60,52,44,36,28,20,12,4,62,54,46,38,30,22,14,6,64,56,48,40,32,24,16,8,
57,49,41,33,25,17,9,1,59,51,43,35,27,19,11,3,61,53,45,37,29,21,13,5,63,55,47,39,31,23,15,7
};
static int _ip_tab[64]=
{
40,8,48,16,56,24,64,32,39,7,47,15,55,23,63,31,38,6,46,14,54,22,62,30,37,5,45,13,53,21,61,29,
36,4,44,12,52,20,60,28,35,3,43,11,51,19,59,27,34,2,42,10,50,18,58,26,33,1,41,9,49,17,57,25
};
static int e_r[48]=
{
32,1,2,3,4,5,4,5,6,7,8,9,8,9,10,11,12,13,12,13,14,15,16,17,
16,17,18,19,20,21,20,21,22,23,24,25,24,25,26,27,28,29,28,29,30,31,32,1
};
static int P[32]=
{
16,7,20,21,29,12,28,17,1,15,23,26,5,18,31,10,2,8,24,14,32,27,3,9,19,13,30,6,22,11,4,25
};
static int pc_1_c[28]=
{
57,49,41,33,25,17,9,1,58,50,42,34,26,18,10,2,59,51,43,35,27,19,11,3,60,52,44,36
};
static int pc_1_d[28]=
{
63,55,47,39,31,23,15,7,62,54,46,38,30,22,14,6,61,53,45,37,29,21,13,5,28,20,12,4
};
static int pc_2[48]=
{
14,17,11,24,1,5,3,28,15,6,21,10,23,19,12,4,26,8,16,7,27,20,13,2,
41,52,31,37,47,55,30,40,51,45,33,48,44,49,39,56,34,53,46,42,50,36,29,32
};
static int ls_count[16]=
{
1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1
};
static int SSS[16][4][16]=
{
14,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7,0,15,7,4,14,2,13,1,10,6,12,11,9,5,3,8,
4,1,14,8,13,6,2,11,15,12,9,7,3,10,5,0,15,12,8,2,4,9,1,7,5,11,3,14,10,0,6,13,
15,1,8,14,6,11,3,4,9,7,2,13,12,0,5,10,3,13,4,7,15,2,8,14,12,0,1,10,6,9,11,5,
0,14,7,11,10,4,13,1,5,8,12,6,9,3,2,15,13,8,10,1,3,15,4,2,11,6,7,12,0,5,14,9,
10,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8,13,7,0,9,3,4,6,10,2,8,5,14,12,11,15,1,
13,6,4,9,8,15,3,0,11,1,2,12,5,10,14,7,1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12,
7,13,14,3,0,6,9,10,1,2,8,5,11,12,4,15,13,8,11,5,6,15,0,3,4,7,2,12,1,10,14,9,
10,6,9,0,12,11,7,13,15,1,3,14,5,2,8,4,3,15,0,6,10,1,13,8,9,4,5,11,12,7,2,14, /* err on */
2,12,4,1,7,10,11,6,8,5,3,15,13,0,14,9,14,11,2,12,4,7,13,1,5,0,15,10,3,9,8,6, /* err on */
4,2,1,11,10,13,7,8,15,9,12,5,6,3,0,14,11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3,
12,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11,10,15,4,2,7,12,9,5,6,1,13,14,0,11,3,8,
9,14,15,5,2,8,12,3,7,0,4,10,1,13,11,6,4,3,2,12,9,5,15,10,11,14,1,7,6,0,8,13,
4,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1,13,0,11,7,4,9,1,10,14,3,5,12,2,15,8,6,
1,4,11,13,12,3,7,14,10,15,6,8,0,5,9,2,6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12,
13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7,1,15,13,8,10,3,7,4,12,5,6,11,0,14,9,2,
7,11,4,1,9,12,14,2,0,6,10,13,15,3,5,8,2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11
};
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
int ConvertDes(unsigned char *source, unsigned char *dest, char flag)
{
unsigned char cardno[16+1], pwd[16+1], pin[16+1], key[16+1], temp[20];
memset(pwd, 0, sizeof(pwd));
memset(pin, 0, sizeof(pin));
strcpy((char *)cardno, T863CARDNO);
strcpy((char *)key, T863KEY);
if (flag == 'e' || flag == 'E')
{
memcpy(pwd, source, 8);
HostDes(cardno, key, pwd, pin, 'e');
memset(temp, 0, sizeof(temp));
HEX_2_DSP(pin, temp, 8);
memcpy(dest, temp, 16);
} else {
memcpy(pin, source, 16);
memset(temp, 0, sizeof(temp));
DSP_2_HEX(pin, temp, 8);
HostDes(cardno, key, pwd, temp, 'd');
memcpy(dest, pwd, 8);
}
return 0;
}
void HEX_2_DSP(unsigned char *hex, unsigned char *dsp, int count)
{
unsigned char i;
unsigned char ch;
for (i = 0; i < count; i++)
{
ch=(unsigned char)((hex[i]&0xf0)>>4);
dsp[i*2]=(char)((ch>9)?ch+0x41-10:ch+0x30);
ch=(unsigned char)(hex[i]&0xf);
dsp[i*2+1]=(char)((ch>9)?ch+0x41-10:ch+0x30);
}
}
void DSP_2_HEX(unsigned char *dsp, unsigned char *hex, int count)
{
unsigned char i;
unsigned char ch1, ch2;
for (i = 0; i < count; i++)
{
ch1 = (unsigned char)dsp[i*2], ch2 = (unsigned char)dsp[i*2+1];
hex[i]=(char)((((ch1<=0x39)?ch1-0x30:(ch1&0xdf)-0x41+10)<<4)
|((ch2<=0x39)?ch2-0x30:(ch2&0xdf)-0x41+10));
}
}
// Card密码加密
void HostDes(unsigned char *card_no, unsigned char *work_key, unsigned char *pin,unsigned char *encrypt_pin, unsigned char flag)
{
unsigned char card_buf[16], pin_buf[17], enpin_buf[8];
unsigned char key_buf[8];
int i, ii;
DSP_2_HEX(work_key, key_buf, 8);
memset(card_buf, 'F', sizeof(card_buf));
memcpy(card_buf, card_no+1, 15);
DSP_2_HEX(card_buf, card_buf, 8);
card_buf[0] = 0;
if(flag == 'e' || flag == 'E' || flag == ENCRYPT)
{
enpin_buf[0] = strlen((char *)pin);
memcpy(pin_buf, pin, strlen((char *)pin));
ii = strlen((char *)pin);
for(i = ii; i<17; i++)
{
pin_buf[i] = 'F';
}
DSP_2_HEX(pin_buf, pin_buf, 8);
Do_XOR(card_buf, pin_buf, 7);
memcpy(enpin_buf+1, card_buf, 7);
Des(enpin_buf, encrypt_pin, key_buf, ENCRYPT);
return;
}
if(flag == 'd' || flag == 'D' || flag == DECRYPT)
{
Des(encrypt_pin, pin_buf, key_buf, DECRYPT);
Do_XOR(pin_buf+1, card_buf, 7);
HEX_2_DSP(pin_buf+1, pin, 7);
pin[pin_buf[0]&0x0f] = 0;
return;
}
}
// 做DES
void Des(unsigned char *source, unsigned char *dest, unsigned char *key, unsigned char flag)
{
char tmp[64];
expand0(key, tmp);
setkeystar((unsigned char *)tmp);
if ( flag == ENCRYPT || flag == 'e' || flag == 'E' )
encrypt0(source, dest);
else
discrypt0(source, dest);
}
// 做异或
void Do_XOR(unsigned char *dest, unsigned char *source, int size)
{
int i;
for(i=0; i<size; i++)
dest[i] ^= source[i];
}
void encrypt0(unsigned char *text, unsigned char *mtext)
{
char ll[64],rr[64],LL[64],RR[64];
unsigned char tmp[64];
int i,j;
ip(text,(unsigned char *)ll,(unsigned char *)rr);
for (i=1;i<17;i++)
{
FF(i,ll,rr,LL,RR);
for (j=0;j<32;j++)
{
ll[j]=LL[j];
rr[j]=RR[j];
}
}
_ip(tmp,(unsigned char *)rr,(unsigned char *)ll);
compress0(tmp,mtext);
}
void discrypt0(unsigned char *mtext, unsigned char *text)
{
char ll[64],rr[64],LL[64],RR[64];
unsigned char tmp[64];
int i,j;
ip(mtext,(unsigned char *)ll,(unsigned char *)rr);
for (i=16;i>0;i--)
{
FF(i,ll,rr,LL,RR);
for (j=0;j<32;j++)
{
ll[j]=LL[j];
rr[j]=RR[j];
}
}
_ip(tmp,(unsigned char *)rr,(unsigned char *)ll);
compress0(tmp,text);
}
void expand0(unsigned char *in, char *out)
{
int divide;
int i,j;
for (i=0;i<8;i++)
{
divide=0x80;
for (j=0;j<8;j++)
{
*out++=(in[i]/divide)&1;
divide/=2;
}
}
}
void compress0(unsigned char *out, unsigned char *in)
{
int times;
int i,j;
for (i=0;i<8;i++)
{
times=0x80;
in[i]=0;
for (j=0;j<8;j++)
{
in[i]+=(*out++)*times;
times/=2;
}
}
}
void ip(unsigned char *text, unsigned char *ll, unsigned char *rr)
{
int i;
char buffer[64];
expand0(text,buffer);
for (i=0;i<32;i++)
ll[i]=buffer[ip_tab[i]-1];
for (i=0;i<32;i++)
rr[i]=buffer[ip_tab[i+32]-1];
}
void _ip(unsigned char *text, unsigned char *ll, unsigned char *rr)
{
int i;
char tmp[64];
for (i=0;i<32;i++)
tmp[i]=ll[i];
for (i=32;i<64;i++)
tmp[i]=rr[i-32];
for (i=0;i<64;i++)
text[i]=tmp[_ip_tab[i]-1];
}
void FF(int n, char *ll, char *rr, char *LL, char *RR)
{
int i;
char buffer[64],tmp[64];
for (i=0;i<48;i++)
buffer[i]=rr[e_r[i]-1];
for (i=0;i<48;i++)
buffer[i]=(buffer[i]+K[n][i])&1;
s_box(buffer,tmp);
for (i=0;i<32;i++)
buffer[i]=tmp[P[i]-1];
for (i=0;i<32;i++)
RR[i]=(buffer[i]+ll[i])&1;
for (i=0;i<32;i++)
LL[i]=rr[i];
}
void setkeystar(unsigned char *bits)
{
int i,j;
for (i=0;i<28;i++)
C[0][i]=bits[pc_1_c[i]-1];
for (i=0;i<28;i++)
D[0][i]=bits[pc_1_d[i]-1];
for (j=0;j<16;j++)
{
LS((char *)C[j],(char *)C[j+1],ls_count[j]);
LS((char *)D[j],(char *)D[j+1],ls_count[j]);
son((char *)C[j+1],(char *)D[j+1],(char *)K[j+1]);
}
}
void s_box(char *aa, char *bb)
{
int i,j,k,m;
int y,z;
char ss[8];
m=0;
for (i=0;i<8;i++)
{
j=6*i;
y=aa[j]*2+aa[j+5];
z=aa[j+1]*8+aa[j+2]*4+aa[j+3]*2+aa[j+4];
ss[i]=SSS[i][y][z];
y=0x08;
for (k=0;k<4;k++)
{
bb[m++]=(ss[i]/y)&1;
y/=2;
}
}
}
void LS(char *bits, char *buffer, int count)
{
int i;
for (i=0;i<28;i++)
{
buffer[i]=bits[(i+count)%28];
}
}
void son(char *cc, char *dd, char *kk)
{
int i;
char buffer[56];
for (i=0;i<28;i++)
buffer[i] = *cc++;
for (i=28;i<56;i++)
buffer[i] = *dd++;
for (i=0;i<48;i++)
*kk++=buffer[pc_2[i]-1];
}
//
void LongDes(unsigned char *Source, unsigned char *Dest,
unsigned char S_Len, unsigned char Flag)
{
int i;
unsigned char *Key=GeyKey(100);
for (i=0; i<S_Len-7; i+=8)
{
Des(Source+i, Dest+i, Key, Flag);
}
}
unsigned char * GeyKey(int n)
{
static unsigned char KeyMade=0;
static unsigned char key[50];
int i;
if (KeyMade==0)
{
memset(key, 0, sizeof(key));
for (i=0; i<n; i++)
Des(key, key, key, 'E');
KeyMade=1;
}
return key;
}
/*
* EncryptKey() -- 加密KEY(明文16位,密文16位)
* in para -- source:明文KEY
* out para -- dest: 密文KEY
* return -- 0: 成功 -1: 失败
*/
int EncryptKey(unsigned char *source, unsigned char *dest)
{
unsigned char key[16+1], key8[8+1], dekey8[8+1], enkey8[8+1];
strcpy((char *)key, T863KEY);
memset(key8, 0, sizeof(key8));
DSP_2_HEX(key, key8, 8);
memset(dekey8, 0, sizeof(dekey8));
DSP_2_HEX(source, dekey8, 8);
memset(enkey8, 0, sizeof(enkey8));
Des(dekey8, enkey8, key8, 'e');
HEX_2_DSP(enkey8, dest, 8);
return 0;
}
/*
* DecryptKey() -- 解密KEY(明文16位,密文16位)
* in para -- source:密文KEY
* out para -- dest: 明文KEY
* return -- 0: 成功 -1: 失败
*/
int DecryptKey(unsigned char *source, unsigned char *dest)
{
unsigned char key[16+1], key8[8+1], dekey8[8+1], enkey8[8+1];
strcpy((char *)key, T863KEY);
memset(key8, 0, sizeof(key8));
DSP_2_HEX(key, key8, 8);
memset(enkey8, 0, sizeof(enkey8));
DSP_2_HEX(source, enkey8, 8);
memset(dekey8, 0, sizeof(dekey8));
Des(enkey8, dekey8, key8, 'd');
HEX_2_DSP(dekey8, dest, 8);
return 0;
}
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